| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cell characteristic recovery operation method for a fuel cell system, which can recover cell characteristics without decreasing the durability of a fuel cell. <P>SOLUTION: The cell characteristic recovery operation method includes: a fuel cell 2 formed by stacking unit cells; a fuel gas supply means 3 for supplying fuel gas to a fuel electrode 2a; and an oxidant gas supply means 4 for supplying oxidant gas to an oxidant electrode 2b, wherein the method recovers cell characteristics by temporarily more decreasing the cell voltage of the fuel cell 2 than that in the normal power generation. When cell voltage is lowered below the previously set value in normal power generation, operation is changed to the condition in which the cell voltage of the unit cell is lower than that in the normal operation, and no hydrogen is generated in proton reduction reaction in the oxidant electrode 2b. The operation condition is returned to that in the normal power generation before the cell voltage of the unit cell is lowered below 0.1 V. <P>COPYRIGHT: (C)2009,JPO&INPIT |
